KR101889626B1 - Measurement and reporting configuration in radio communication networks - Google Patents

Measurement and reporting configuration in radio communication networks Download PDF

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KR101889626B1
KR101889626B1 KR1020167006782A KR20167006782A KR101889626B1 KR 101889626 B1 KR101889626 B1 KR 101889626B1 KR 1020167006782 A KR1020167006782 A KR 1020167006782A KR 20167006782 A KR20167006782 A KR 20167006782A KR 101889626 B1 KR101889626 B1 KR 101889626B1
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cells
measurements
measurement
cell
subframes
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KR20160036069A (en
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이아나 시오미나
무하마드 카즈미
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텔레호낙티에볼라게트 엘엠 에릭슨(피유비엘)
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/10Scheduling measurement reports ; Arrangements for measurement reports
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058Allocation criteria
    • H04L5/0073Allocation arrangements that take into account other cell interferences
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/08Testing, supervising or monitoring using real traffic
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/12Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel
    • H04W72/1263Schedule usage, i.e. actual mapping of traffic onto schedule; Multiplexing of flows into one or several streams; Mapping aspects; Scheduled allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J11/00Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023Interference mitigation or co-ordination
    • H04J11/005Interference mitigation or co-ordination of intercell interference
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/12Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel
    • H04W72/1205Schedule definition, set-up or creation
    • H04W72/1257Schedule definition, set-up or creation based on resource usage policy
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/12Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel
    • H04W72/1278Transmission of control information for scheduling
    • H04W72/1289Transmission of control information for scheduling in the downlink, i.e. towards the terminal

Abstract

A wireless device, a network device, an inspection equipment and a method in a heterogeneous wireless communication system configured to perform and report a measurement considering a pattern including at least two types of subframes. The wireless device includes a transceiver and a processing unit. The transceiver is configured to send and receive signals from more than one cell and to receive information defining a first pattern associated with the first cell. Wherein the processing unit determines a second pattern associated with the second cell based on at least one of the first pattern and an indicator that associates the first pattern with the second pattern or a predefined rule, And report the measurement result to the network node based on the measurement, wherein the measurement result is associated with a signal received from the at least one number of cells.

Description

TECHNICAL FIELD [0001] The present invention relates to a measurement and reporting configuration in a wireless communication network,

Related application

The present application has been made by Iana Siomina and Muhammad Kazmi No. 61 / 526,145, filed August 22, 2011, entitled " Measurement and Reporting Configuration Under Partial Neighbor Cell Lists in Heterogeneous Networks ", the disclosure of which is incorporated herein by reference Quot; is incorporated herein by reference.

Field of the Invention [0002] The present invention relates generally to measurement and reporting in wireless communication networks, and more particularly to methods, systems, apparatuses and methods for configuring, performing and reporting measurements taking into account patterns comprising at least two types of subframes. Software.

Wireless communication networks were originally developed primarily to provide voice services over circuit-switched networks. For example, with the introduction of packet-switched bearers in so-called 2.5G and 3G networks, It was possible to provide data services as well as voice services. Eventually, the network architecture is likely to evolve towards any Internet Protocol (IP) network that provides both voice and data services. However, network operators will have to make substantial investments in existing infrastructure, and thus typically will prefer to move to all IP network architectures in order to gain enough value from their investments in existing infrastructure. In addition, using legacy infrastructure, At the same time, in order to provide the capabilities needed to support the next generation wireless communication applications, the network operator is required to overlay the next generation wireless communication system on the existing circuit switched or packet switched network as a first step in transitioning to all IP based networks. The network can be deployed. Alternatively, the wireless communication system may evolve from one generation to the next while still providing backward compatibility to legacy equipment.

One example of this evolved network is based on Universal Mobile Telecommunication System (UMTS), which is an existing third generation (3G) wireless communication system evolving to high speed packet access (HSPA) technology. Another alternative is to introduce a new air interface technology within the UMTS framework, e.g., the so-called Long Term Evolution (LTE) technology. Target performance goals for LTE systems include, for example, 200 active calls per 5 MHz cell and sub 5 ms latency for small IP packets. Each new generation, or subset, of the mobile communication system adds complexity and functionality to the mobile communication system, which can be expected to improve the proposed system or continue a completely new system in the future.

LTE uses orthogonal frequency division multiplexing (OFDM) on the downlink and discrete Fourier transform (DFT) spreading OFDM on the uplink. Thus, a basic LTE downlink physical resource may be viewed as a time-frequency grid, as illustrated in FIG. 1, where each resource element is associated with one OFDM subcarrier for one OFDM symbol interval . In the time domain, the LTE downlink transmission is organized into radio frames of 10 ms, and each radio frame consists of 10 subframes of the same size, T subframe = 1 ms, as shown in FIG.

In addition, resource allocation in LTE is typically described in terms of resource blocks, where one resource block corresponds to one slot (0.5 ms) in the time domain and 12 adjacent subcarriers in the frequency domain. Resource blocks are numbered starting from 0 at one end of the system bandwidth in the frequency domain. The downlink transmissions are scheduled dynamically, i.e., in each subframe, the base station (typically referred to as eNodeB in LTE) transmits data to a terminal and to a certain resource block during the current downlink subframe And transmits control information indicating whether the control information is transmitted. This control signaling is typically transmitted in the first 1, 2, 3 or 4 OFDM symbols in each subframe. A downlink system using three OFDM symbols as a control region is illustrated in Fig.

Placement of low power nodes (such as pico base stations, home eNodeBs, relays, remote wireless heads, etc.) to improve macro network performance in terms of network coverage, capacity and service experience of individual users Has been growing steadily over the past few years. At the same time, there is a need for improved interference management techniques to address interference problems that arise due to significant transmission power changes between, for example, previously developed cell and cell related technologies for more uniform networks Was recognized.

In 3GPP, a heterogeneous network has been defined as a network in which low-power (e.g., pico) nodes with different transmit power are deployed across macrocell layouts, which also means non-uniform traffic distribution. Such a network may be used in a small geographical area having a higher user density and / or higher traffic intensity, for example, in a particular area, so-called traffic hotspots, It is effective in capacity expansion. Heterogeneous networks can also be seen as a way to increase network density to adapt to traffic demands and the environment. However, heterogeneous networks also create the challenge that such networks must be designed to ensure efficient network operation and a good user experience. Some challenges relate to increased interference in attempts to increase small cells associated with low power nodes (i. E., Cell range expansion), and other challenges relate to potentially increasing interference in the uplink due to mixing of large and small cells .

According to 3GPP, heterogeneous networks include networks where low power nodes are deployed throughout the macrocell layout. In a heterogeneous network, the interference characteristics may be significantly different from homogeneous networks in the downlink or uplink or both.

Figure 4 illustrates some situations that can occur in a heterogeneous network. In FIG. 4, user equipment (UEs) placed in macrocell 10 can be served by high power base station 12. The UEs in the cells 15a, 15b, 15c, and 15d may be served by low power (e.g., pico) base stations 17a, 17b, 17c, and 17d, respectively. The cells 15a, 15b, 15c, and 15d are smaller than the macrocell 10 and overlap at least partially with the macrocell 10.

The UE 19a, which is located in both the cell 10 and the cell 15a and is served by the base station 12, Receive. The UE 19b placed in the area where the cell 15b overlaps with the macro cell 10 and is served by the base station 12 may cause serious interference to the base station 17b. The UE 19c placed in the area where the cell 15c overlaps with the macro cell 10 and is served by the base station 17c receives interference from the base station 17b. The UE 19d placed in the area where the cell 15d overlaps with the macro cell 10 and is served by the base station 17d receives interference from the base station 12. [

A conventional downlink cell allocation rule may be used to determine whether the RSRP (i.e., the reference signal reference power < RTI ID = 0.0 > ) -Based approach, another challenging interference scenario occurs in so-called cell range expansion. This cell range expansion is illustrated in FIG. A high power (macro) base station 20 may serve UEs in a cell with a radius 21 (i.e., a small dashed line) and a low power (pico) base station 22 may serve UEs within a cell with a normal radius 23 . ≪ / RTI > The cell range of the cell served by the base station 22 may be expanded according to the DELTA parameter and the wireless device 25 may be within the range potentially served by the base station 22, May be served by the base station (22) instead of being served by the base station (20). In Figure 5, the cell range extension indicated by the DELTA parameter between points (A and B) is limited by DL (downlink) performance because typically when the cell size of neighboring cells becomes more balanced, This is because the performance is improved.

In wireless networks, maintaining good signal quality is a requirement for reliable and high bit rate transmission as well as robust control channel performance. The signal quality is determined by the relationship between the received signal strength and the total interference and noise received by the receiver. Best of all, a good network plan that includes cell planning is a prerequisite for successful network operation, but it is static. For more efficient use of radio resources, this network plan is supplemented by semi-static and dynamic radio resource management mechanisms, which are also intended to facilitate at least interference management, and by deploying more advanced antenna techniques and algorithms .

One way of dealing with interference is, for example, by employing a more advanced transceiver technology, for example, by implementing an interference suppression or interference cancellation mechanism in the receiver. Another approach that may not be complementary or complementary to the former is to design efficient interference coordination algorithms and transmission schemes in the network. Adjustments can be realized in a static, semi-static or dynamic manner. A static or semi-static scheme may be used to reserve an orthogonal time-frequency resource (e.g., a portion of bandwidth and / or time instances) for strongly interfering transmissions Can be relied upon. This interference adjustment may be implemented for all channels or for a particular channel (e.g., data channel or control channel) or signal. Dynamic adjustment may be implemented, for example, through scheduling.

An improved inter-cell interference coordination (eICIC) mechanism has been developed specifically for heterogeneous networks. These (currently standardized) Some of the mechanisms allow the UE to make at least some measurements, such as measurements for radio resource management (RRM), measurements for radio link monitoring (RLM), and channel state information (CSI) Lt; / RTI > This mechanism involves configuring a pattern of low interfering subframes at the transmitting node and constructing a measurement pattern for the UE.

There are two types of patterns that allow eICIC to make restricted measurements on the downlink (DL): limited measurement patterns that are signaled to the UE by the network nodes, Transmission patterns, also known as Almost Blank Subframe (ABS) patterns, which are configured to describe the transmission activity of the wireless nodes, are defined and can be exchanged between wireless nodes.

In order to enable limiting measurements for RRM, RLM, CSI as well as demodulation, the UE receives UE specific signaling (via the radio resource controller) of the following pattern set (as described in TS 36.331 v10.1) can do.

Pattern 1: Single RRM / RLM measurement resource limitation for serving cell;

Pattern 2: One RRM measurement resource limit per neighbor (up to 32 cells) per frequency (for the current serving frequency only);

Pattern 3: Resource limitations for CSI measurements of serving cells with two subframe subsets configured per UE. Patterns are used for FDD (frequency division duplex) and TDD (time division duplex) (I. E., A subframe of the first type and a subframe of the second type) characterized by different lengths and periodicity, for example, 40 subframes for FDD and 20 subframes for TDD. , A bit string representing 60 or 70 subframes. The bounded measurement subframe may be used to provide enhanced interference that can be implemented by the UE constructing an almost empty subframe (ABS) pattern in the eNodeB To perform the measurement in the subframe having the condition . Although similar patterns may be defined for UE frequency measurements such as inter-frequency cell search, reference signal received power (RSRP), reference signal reception quality (RSRQ), positioning measurements, etc., In TS 36.331 v10.1, only an intra-frequency restricted measurement pattern (also known as a measurement resource limit pattern) is defined. Thus, the measurement pattern can be configured to measure inter-frequency cells for each frequency carrier. Similarly, the measurement pattern can also be used to perform inter-RAT E-UTRAN measurements. In this case, for a serving RAT (e.g., UTRAN, GERAN, CDMA2000, HRPD, etc.) Cell is a cell in which the UE has received an E-UTRAN inter-RAT measurement (e. G., E-UTRAN cell search between RAT, RSRP, RSRQ, We will construct a pattern that enables execution.

The restricted measurement pattern is provided to the UE via dedicated signaling and therefore applies only to UEs in CONNECTED mode. In the case of a UE in idle mode, a similar pattern may be provided via broadcast signaling.

The ABS pattern represents a subframe when the eNodeB limits its transmission (e.g., does not schedule or transmits at low power). A transmission-restricted subframe is referred to as an ABS subframe. Currently, the eNodeB can suppress data transmission in the ABS subframe, but the ABS subframe may not be completely empty - at least some of the control channel and physical signals are still transmitted. Examples of control channels transmitted in the ABS subframe when data is not transmitted are PBCH (Physical Broadcast Channel) and PHICH Harq indicator channel). Examples of physical signals that should be transmitted are the cell specific reference signal (CRS) and the synchronization signals (PSS and SSS), whether the subframe is ABS or not. A positioning reference signal PRS may also be transmitted in the ABS subframe.

If the MBSFN (via a single frequency network) Multimedia broadcast) subframe coincides with the ABS, the subframe is also regarded as ABS. The CRS is not transmitted in the MBSFN subframe except for a first symbol that can prevent CRS interference from the aggressor cell to the data area of the measurement cell.

The ABS pattern may be exchanged between eNodeBs, for example, via the X2 interface, Information about the pattern is not transmitted to the UE, PCT application, That is, the child filed on June 23, 2011. I. Siomina and Am. As described in International Application No. PCT / SE2011 / 050831 of M. Kazmi. In this PCT application, a multi-level pattern has also been described in which the " level " can be associated with a decision involving the setting of one or more parameters, such setting characterized by low transmission activity, Transmission power, bandwidth, frequency, subcarrier subset, and the like. This pattern may be associated with the entire transmission or specific signal (s) (e.g., a positioning reference signal, or PRS) or channel (s) (e.g., data channel and / or control channel) .

With respect to the neighboring cell information, the neighboring cell lists NCLs currently have a mobility purpose, for example, . Transmitting a list of neighboring cells to an UE in an E-UTRA wireless network is currently being carried out in accordance with 3GPP TS 36.331, Evolved Universal Terrestrial Radio Access (E-UTRA), Radio Resource Control (RRC), Protocol Specification, v10.1.0 Feature. Transmitting a list of neighboring cells is optional in LTE because it is necessary for the UE to meet the measurement requirements (e.g., cell search, RSRP and RSRQ accuracy) without receiving an explicit neighbor cell list at the eNodeB to be. Because the UE needs to meet more stringent measurement requirements (e.g., cell search, CPICH RSCP and CPICH Ec / No accuracy) only when the explicit neighbor cell list is signaled by the radio network controller (RNC), the E In UTRA, similar functions (ie signaling of the NCL) It was compulsory.

Neighboring cell information in the E-UTRA may be signaled on the broadcast control channel (BCCH) logical channel in the system information block or on the dedicated control channel (DCCH) in the RRC measurement configuration / reconfiguration message via the RRC.

Only for cell reselection within frequency The relevant neighboring cell related information is signaled with an information element (IE) SystemInformationBlockType4, while the IE SystemInformationBlockType5 is used for inter frequency cell reselection.

Both System Information Blocks (SIBs) are signaled via RLC dedicated signaling in the System Information (SI) message over the BCCH logical channel using the RLC Transparent Mode service. Such SI system information and further neighbor cell information can be obtained in both RRC_IDLE and RRC-CONNECTED states.

Mapping SIBs to SI messages is flexible configurable by a schedulingInfoList with the limitation that each SIB is only included in a single SI message and only SIBs with the same scheduling requirement (periodicity) can be mapped to the same SI message. The transmission periodicity of SIB4 and SIB5 may be comprised of one of 8, 16, 32, 64, 128, 256 and 512 radio frames.

Considering the contents of the signaled cell information to support mobility of the UE in the context of frequency, neighbor cell related information that is only related to cell reselection in frequency is transmitted in IE SystemInformationBlockType4, Cells with optional parameters are also included. The maximum number of cells in the NCL or black cell list (BCL) 16 cells. The NCL includes physical cell identifications (PCIs) and corresponding cell offsets. The offset is used to indicate the cell or frequency specific offset to be applied when evaluating candidates for cell reselection or when evaluating triggering conditions for measurement reporting, and is currently in the range [-24dB, 24dB]. The BCL includes a physical cell identification range, which includes the starting (lowest) cell identification within that range and the identification number within that range. The physical cell identification range is defined in the standard document It is specified as follows.

Figure 112016024778683-pat00001

Considering the contents of the signaled cell information to support the mobility of the UE in the inter-frequency context, the neighbor cell related information that is only relevant for inter-frequency cell reselection is signaled as IE SystemInformationBlockType5. This IE includes not only cell specific reselection parameters but also cell reselection parameters that are common to frequency. Using the current specification, the parameters per signal carrier frequency and optionally signaled per cell include the following.

Carrier frequency (or ARFCN),

An indicator of the presence of antenna port 1,

· Allowable measurement bandwidth,

Reselection parameters describing RSRP and

Neighbor cell configuration - A 2-bit bit string used to provide information related to the MBSFN and TDD UL / DL configuration of neighbor cells.

The reselection of the parameters includes the following.

- selection of an indicator for the minimum received RSRP required in the E-UTRAN cell, in the range [-140 dBm, -44 dBm]

A reselection timer value for E-UTRA indicating the time that the cell should be evaluated and graded, and

The reselection threshold for RSRP when reselecting in the higher and lower priority directions.

The 2-bit string of the neighbor cell configuration is:

00: Not all neighboring cells have the same MBSFN subframe assignment as serving cell.

10: The MBSFN subframe allocation of all neighbor cells is equal to or a subset of the MBSFN subframe of the serving cell.

01: The MBSFN subframe is not present in all neighboring cells.

11 different UL / DL allocation in neighboring cells for TDD compared to serving cell.

In the case of TDD, 00, 10 and 01 are used only for the same UL / DL allocation in the neighboring cell as compared to the serving cell.

To the current specification for NCL per carrier frequency or frequency per cell The optional parameters that can be transmitted along with same .

Offset (0 dB default),

Maximum UE transmit power (not present If not, the UE applies the maximum power according to the UE capability)

Rate-dependent scaling of E-UTRA reselection timer values factor,

Absolute cell reselection priority of interest carrier frequency / frequency set,

The reselection threshold for RSRP when reselecting to a higher and lower priority direction, and

Frequency BCL.

The maximum number of EUTRA carrier frequencies for inter-frequency NCL is eight. The maximum number of cells in the frequency-to-frequency NCL or black cell list (BCL) 16 cells.

Requirements for a list of neighboring cells signaled in E-UTRA for mobility purposes as specified in 3GPP TS 36.331 Considering applicability, the UE requirements associated with the contents of the SystemInformationBlock4 or SystemInformationBlock5 carrying the NCI in frequency and in the frequency respectively, may be used elsewhere, e.g., in procedures using the system information of interest, and / It does not apply differently. This means that in the E-UTRA the UE does not have an NCL and needs to meet the measurement requirements. On the other hand, however, if the NCL is signaled, the UE still needs to meet current measurement requirements because the UE can ignore the NCL or supplement it with a blind cell search.

The UE specification identifies the new cell and maintains a list of a predetermined minimum number of cells for RSRP / RSRQ measurements (e.g., periodic measurements, event-triggered, etc.). According to 3GPP TS 36.133, the UE must perform measurements on at least a predetermined minimum number of identified cells, with or without the blind search described above. In the RRC_CONNECTED state, the measurement period for in-frequency measurements is 200ms. If the measurement interval is not activated, the UE will be able to perform RSRP and RSRQ measurements on the cells in the eight identified frequencies and the UE physical layer will have a measurement period of 200 ms Have You will be able to report measurements to higher layers. When the measurement interval is activated, the UE must measure at least Y measurement the measurement can be performed on intra cells, where Y measurement intra is defined by the following equation. If the UE determines that Y measurement If more than intra cells are identified, the UE will perform measurements of cells in at least eight identified frequencies, but the reporting rate of RSRP and RSRQ measurements of cells from the UE physical layer to the upper layer may be reduced. In the case of FDD,

Figure 112016024778683-pat00002

, Where X basic measurement FDD = 8 (cells), T Measurement _ Period, Intra = 200 ms is the measurement period for the in-frequency RSRP measurement, T Intra is the measurement period available for the in- It is time. The time is assumed to be usable to perform in-frequency measurements whenever the receiver is reliably activated for carriers in frequency. For example, a gap pattern # 0 is configured and Intra T = 170ms 200ms per L1 time period since if the DRX (discontinuous reception) is not used or DRX≤40ms, will result in the five intervals of 6ms for 200ms duration L1.

Next, in addition to the constraint measurement pattern for neighbor cell measurements, a list of cells up to maxCellMeas 32 may optionally be provided, taking into account the signaling of neighboring cell lists to support interference coordination. If such a list is provided, the list is interpreted as a list of cells to which the limit measurement pattern applies. If the list is not provided, the UE applies time domain measurement resource limits for all neighbor cells.

With respect to the requirement applicability to the list of neighboring cells signaled in E-UTRA for interference coordination, the same requirements as described above apply to the requirements related to mobility in current standards. Whenever the limit measurement pattern is signaled, the neighboring cell list signaling It was discussed about making mandatory. For cells not in the eICIC list, the Rel8 / 9 mechanism is claimed to be sufficient. The following were considered.

The UE only needs to measure and report only two restricted cells if a constrained measurement pattern is configured for a neighboring cell,

If the UE is configured for limited measurement, then only UE processing power within eight frequencies is needed if the cell list is configured with a constraint measurement pattern for neighboring cells.

In the current standardized environment, many problems remain associated with the processing of neighbor cell lists, measurements, and measurement patterns.

One problem is that the UE's behavior and measurement requirements are ambiguous when the cell list is configured for limiting measurements. For example, if a list is provided with a pattern configuration, the measurement will be performed in a restricted subframe, but it is unclear whether a minimum of eight reported cells can also be exclusively applied to the restricted subframe.

Another problem is that it is unclear in which subframe the measurements reported for cells that are not in the list have been performed.

In a solution that mandates a list of neighboring cells, there is a problem that it is necessary for the UE to still measure and report on at least eight cells in the restricted subframe. in this case, As before, for cells that are not in the list, it is unclear in which subframe the reported measurements were performed.

In another solution, there is a problem that the UE may first report the measurements only for a very limited number of cells (e.g., two less than the minimum of eight cell requirements). Next, if a small number of cells are included in the list, the UE can not report measurements from the remaining cells and may degrade system performance.

Another problem is that there is no measurement requirement for the IDLE state, even if the limiting measurement pattern can be standardized for the IDLE state in the future.

In this specification, the following abbreviations are used.

3GPP: Third Generation Partnership Project

BS: base station

CRS: Cell specific reference signal

eICIC: Enhanced ICIC

eNodeB: Evolved Node B

E-SMLC: Evolved SMLC

ICIC: Intercell interference coordination

LTE: Long Term Evolution

PCI: Physical cell identification

RAT: Wireless connection technology

RRC: Radio Resource Control

SFN: System frame number

SINR: signal-to-interference ratio

UE: User Equipment

UMTS: Universal Mobile Telecommunication System

Some embodiments described below implement applicable measurement rules when restricted measurement patterns are configured to ensure that the UE meets all the requirements that are needed. Some embodiments implement pattern configuration rules, particularly when a constrained measurement pattern or a transmission pattern is configured for multiple carriers. Some embodiments are configured to perform and report comparative measurements. Some embodiments relate to constructing a limit measurement for a UE in an IDLE state or some other low-activity state (e.g., dormant state).

According to an exemplary embodiment, a wireless device comprising a transceiver / RTI > The transceiver includes at least a first carrier frequency To receive at least a radio signal. The transceiver is further configured to receive information about a first pattern associated with the first carrier frequency, the first pattern being a sequence of subframes of a first type and a second type of subframe . The wireless device also includes a processor configured to determine a second pattern. Wherein the processor determines the second pattern based on the first pattern and an indication and a predetermined rule, the indicator or predetermined rule associating the first pattern with the second pattern, The pattern and the second pattern are at least one of a measurement pattern and a transmission pattern. The transmission pattern may be referred to as a signal transmission pattern or a signal transmission pattern interchangeably. The signal may be a physical signal or a physical channel or a combination thereof and may be transmitted over one or more time-frequency resources.

According to yet another embodiment, a method of processing a wireless signal associated with wireless communication by a wireless device is performed. The method includes receiving a radio signal over at least a first carrier frequency. The radio signal includes information about a first pattern associated with the first carrier frequency. The first pattern is a sequence of a first type sub-frame and a second type sub-frame. The method further comprises determining a second pattern. Wherein the second pattern is determined based on at least one of the first pattern and the indicator and predetermined rules, An indicator or predetermined rule associates the first pattern with the second pattern. Wherein the first pattern and the second pattern are at least one of a measurement pattern and a transmission pattern.

The accompanying drawings, which are incorporated in and form a part of this specification, illustrate one or more embodiments and, together with the description, illustrate such embodiments.
Figure 1 is a schematic diagram illustrating an LTE time-frequency grid.
2 is a schematic diagram illustrating an LTE frame structure.
3 is an approximate diagram illustrating an LTE subframe.
4 illustrates various interference scenarios in a heterogeneous network.
5 is a schematic diagram illustrating cell range expansion in a heterogeneous network;
6 is a schematic diagram illustrating a wireless communications network including one or more wireless devices in accordance with an illustrative embodiment.
7 is a schematic diagram of a wireless device in accordance with one embodiment.
8 is a schematic diagram of a network device according to an exemplary embodiment.
Figure 9 is a schematic diagram of an inspection instrument according to an exemplary embodiment.
10 is a flow diagram of a method performed in a wireless device according to another exemplary embodiment.

The following detailed description of an exemplary embodiment refers to the accompanying drawings. In the several drawings, the same reference numerals denote the same or similar components. In addition, the following detailed description does not limit the present invention. The following embodiments are discussed in connection with the terminology and structure of LTE systems for the sake of brevity. However, the embodiments discussed below are not limited to LTE systems and may be applied to other telecommunications systems as well.

Reference throughout this specification to " one embodiment " or " an embodiment " means that a particular feature, structure, or characteristic described in connection with one embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase " in one embodiment " or " in one embodiment " in various places in the specification are not necessarily all referring to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any suitable manner in one or more embodiments.

Current < RTI ID = 0.0 > In order to solve the above-mentioned problems associated with the method, some of the exemplary embodiments described below,

The measurement rules when restricted measurement patterns are configured to ensure that the UE meets all necessary requirements,

The pattern construction rules when the limiting measurement pattern or transmission pattern is constructed specifically for multiple carriers,

· Comparative measurements, and

Provides a way to configure limit measurements for UEs in the IDLE state or some other low-activity state.

The terms " base station " and " user equipment (UE) " are used herein in general terms. Those skilled in the art will recognize that the evolved Node B (eNodeB) in the LTE architecture may correspond to a base station, i.e., the base station is a possible implementation of the eNodeB. However, the term " eNodeB " is also wider in some sense than an ordinary base station, since the eNodeB generally refers to a logical node. The term " base station " is used herein to include a base station, NodeB, eNodeB, or other node specific to another structure. The term " user equipment " is used herein to encompass any wireless device in a wireless communication system.

As illustrated in FIG. 6, wireless devices 130a-130i operate in a heterogeneous network comprising a plurality of cells. The large cell 111 is served by a high power (macro) base station 110. Small cells 121A and 121B are served by low power (e.g., pico) base stations 120A and 120B.

The wireless device 130 includes a transceiver 132 configured to transmit and receive signals in more than one cell as illustrated in FIG. 7, and a processing unit 134 configured to perform measurements associated with the signal. The wireless device 130 may also include a memory 136 that stores executable code that causes the processing unit 134 and the transceiver 132 to operate as follows.

The transceiver 132 is further configured to receive information defining a first pattern that is a sequence of a first type of subframe and a second type of subframe, wherein the first pattern is associated with the first cell. The processing unit 134 is further configured to determine a second pattern associated with the second cell (which is another sequence of sub-frames of the first type and sub-frames of the second type). The processing unit 134 determines the second pattern based on the first pattern and an indication (or predetermined rule) relating the first pattern and the second pattern.

An indicator associating the first pattern with the second pattern may be received from the configuration network node. The configuration node may be a node 145 or other node in the network. In some embodiments, the processing unit 134 may be further configured to associate the first pattern with the second pattern based on a predetermined rule, the rule being stored in the user equipment.

The processing unit 134 is also configured to report to the network node 145 measurement results associated with a portion of the signal. That is, the processing unit 134 reports measurement results associated with signals received from one or more cells. The processing unit 134 may be configured to determine the number of one or more cells based on one or more rules based on whether a (neighboring) cell list representing the first cell is received. Details regarding embodiments of these rules are described below. The processing unit 134 may also be configured to perform measurements according to other rules, which may also be described below. In the following detailed description, for ease of explanation, the present specification will refer to a general UE, for example, a wireless device as illustrated in FIG. Thus, when describing that a UE performs a particular operation, it means that the processing unit 134 and the transceiver 132 are configured to perform certain operations. Although described as a UE as a measurement unit, those skilled in the art will appreciate that a " UE " can be any wireless device or node (e.g., a PDA, laptop, mobile, sensor, fixed repeater, mobile repeater, or even a femto base station, Quot; wireless node with an interface "). ≪ / RTI >

In at least some embodiments, performing the measurements may also include cell identification as described below, which also provides other measurement examples. At least some of the embodiments described as using the rules herein may be implemented as a UE action or as explicit signaling (e.g., sending an indicator at the UE).

Although transmission and measurement patterns are primarily discussed in the context of eICIC in the background section, in at least some embodiments this pattern may be used for other purposes such as interference coordination, Lt; / RTI > Also, while the embodiments disclosed herein are primarily focused on patterns used in such networks for heterogeneous networks and interference coordination, such focus is not intended to be limiting of the present invention, 3GPP definition of 3GPP. For example, the method may also be employed in traditional macro deployments and / or networks operating more than one radio access technology (RAT).

The signaling described herein may take place over a direct link or logical link (e.g., via an upper layer protocol and / or via one or more network nodes). For example, the signaling from the coordinating node may pass through another network node, for example, a wireless node. This embodiment may be applied to a single frequency network, e. G. Multi-carrier and multi-frequency networks Can be applied. In this case, the disclosed signaling associated with the various patterns may also be further associated with a particular frequency or carrier, and information about this may also be signaled.

A cell is associated with a wireless node, in which case a wireless node or a wireless network node or eNodeB is used interchangeably in this description and refers to any node that sends and receives wireless signals used for measurements in a general sense, eNodeB, A macro / micro / pico base station, a home eNodeB, a relay, or a repeater. Micro eNodeBs are also known interchangeably as medium-range eNodeBs. A wireless node herein may include a wireless node operating in one or more frequencies or frequency bands, and may be a wireless node capable of carrier aggregation (CA). The wireless node may also be, for example, a single or multiple RAT node capable of supporting multiple standard radio (MSR) or operating in a mixed mode.

Since multiple serving cells can be made of a carrier set, a " serving cell " is generally used in the description of CA and non-CA systems. With CA, the primary cell is an example of a serving cell. The wireless node also does not create its own cell, but is still a node that receives the UL radio signal and performs UL measurements, e.g., a position measurement unit (LMU) or a wireless node sharing a cell ID with another wireless node Measurement unit.

The term " centralized network management node " or " coordinating node ", as used herein, is a network node that may be a wireless network node coordinating radio resources with one or more wireless network nodes. Other examples of coordination nodes include node monitoring and configuration nodes, operational support system (OSS) nodes, operation and maintenance (O & M) nodes, Such as a Minimization of Drive Tests (MDT) node, a SON node, a location node, a P-GW or a serving gateway (S-GW) network node or a femto gateway node Nodes.

This embodiment is not limited to LTE, and may be applied to any radio access network (RAN), single or multiple RAT. Some other RAT examples are LTE-Advanced, UMTS, GSM, cdma2000, WiMAX, and WiFi.

Assuming that all the UE measurement actions when the constraint measurement pattern is first constructed assume that the UE receives the Y cells in the cell list associated with the constraint measurement pattern for which the measurement is to be performed. Receiving such a cell means receiving at least the cell identifier of the cells to be measured. If the cell identification is included in the measurement, then the UE then determines if the detection level of that cell is within the allowed range (e.g., , It is possible to search these cells by using a limited measurement pattern. In some embodiments, the pattern may be partially used for cell identification, for example, pure cell identification may be performed without a pattern, The confirmation step may be performed using a measurement pattern. After cell detection, the UE continuously measures (e. G., RSRP and / or RSRQ) Can be performed.

When performing a measurement within a predetermined time when a constrained measurement pattern is configured, the following rules may be applied (independently or in some combination) by the UE.

According to some embodiments, the UE is configured to perform and report measurements in the restricted subframe for min (Y, Ymin ) cells in the list by an external node or by an internal method, where Ymin is a predefined number Or defined by rules. For example, Y min = 4. As another example,

Figure 112016024778683-pat00003
, Where X basic Is the minimum number of cells to be measured in the case of k * T basic (i.e., T avail = k * T basic ) available for measurement at all times, T basic is the reference time (for example, 200ms) 1. For example, X basic = 8, T basic = 200 ms, k = 2/10 (e.g., two DL subframes for TDD UL / DL configuration 0), and measurement pattern 1/10 Available for this measurement), Y min = floor (8 * (1/2)) = 4.

As another example, the time available for measurement, T avail , Explain. For example, if the interval is of interest On the frequency , The available measurement time is the time at which the measurement can be performed for this frequency in that interval (e.g., 60ms of 480ms, where pattern # 0 is 40ms period when interval is used for one frequency). As another example, if a configured measurement interval is not used at the frequency of interest (e.g., serving cell frequency), the available time does not include the time the interval is used for inter-frequency measurement. As another example, if Y min also contains a serving cell, the number of neighboring cells is Y min -1.

The neighboring cell list may also include serving cells, for example, even if a separate serving cell pattern is configured for this cell. This is to allow the serving cell to be measured in a different subframe than those specified by a particular serving cell measurement pattern.

According to another embodiment, the UE is configured to transmit at least X min (Y min < X min ) cells for at least Y min cells if such neighboring cell lists are not provided in relation to the constrained measurement pattern, Measurement and reporting can be performed. In one embodiment, Y min And X min cells may be measured in the restricted measurement subframe, e.g., the network will provide a corresponding list if desired to receive more cell measurements. The UE must be able to perform and report measurements on at least X cells, regardless of whether the cell list is provided with a constrained measurement pattern. In one embodiment, min (Y, Y min ) < = X.

The UE may be represented by a constraint measurement pattern It should be possible to perform and report measurements on at least X-min (Y, Y min ) in all subframes that can not be represented. Suppose, for example, that the UE is provided with a list of neighboring cells consisting of three cells, that is, identifiers of at least Y = 3 neighbor cells to be identified and measured. The minimum requirement for the number of cells that the UE needs to measure during the L1 period (e.g., 200 ms in non-DRX) is 8 (i.e., X = 8 including the serving cell). Next, in accordance with the predefined rules, the UE also identifies and performs measurements (e.g., RSRP / RSRQ) for the remaining four neighboring cells in all subframes (after they are identified).

In one embodiment, according to different rules for the remaining cells (i.e. not included in the cell list), the UE may meet the requirements corresponding to the unmeasured measurements. Typically, the UE will only measure neighbor cells of X = 3, or alternatively the UE may measure all cells (i.e., 7 neighboring cells) using a constraint pattern. However, this is problematic because performance degrades for all cells. The requirements for untimed measurements such as in legacy systems are less stringent (or at least different). For example, measurement periods for non-standard measurements are typically at least shorter in DRX.

According to some alternative embodiments, if the UE is configured with a constrained measurement pattern, the UE may perform and report measurements on at least Z cells in an unrestricted subframe (not represented by a measurement pattern). In one embodiment, Z + min (Y, Y min ) = X. In another example, Z + min (Y, Y min ) > = X, for example, some cells may be measured in the unrestricted and restricted measurement subframes. For example, a cell that can be measured in an unrestricted subframe may be a macrocell in a macro-pico interference scenario or a CSG femtocell in a macro-femto interference scenario.

According to another embodiment, when the UE receives a list of at least two cells comprising at least one cell in two lists, the first list may be a universal or mobile cell list, If it can be an associated list, the UE performs measurements on these cells (e.g. common cells in two lists) in the unrestricted and restricted subframes and reports them separately.

The rules described so far are one Frequency, or a group of frequencies or CC, RAT, and so on. For example, X is the full May be the number of cells.

The same rules can be applied for non-DRX states and at least some DRX states.

These rules can also be applied when the UE performs other measurements (partially or completely) in parallel with the restriction measurement, in which case the restriction measurement may be for mobility, for example. Examples of other measurements are acquisition of system timing information (e. G., SFN), system acquisition of target cells such as CGI, CSG indicators, and the like. In this context, the term " parallel " means that the measurement period during which different types of measurements are performed overlaps at least partially.

Considering the measurement report when the restricted measurement pattern is constructed, the following rules and corresponding signaling means can be used by the UE (independently or in any combination) when reporting the measurement within a predetermined time period when the limited measurement pattern is configured: Can be applied.

In one embodiment, the UE may report cells that are not included in the list (in a particular case where the list can not be configured at all with a constraint measurement pattern). In another embodiment, such a cell may only be measured in unrestricted subframes. In yet another embodiment, such a cell may be measured only in a restricted subframe. In another embodiment, such a cell may be measured in limited and unrestricted frames and individual or comparative measurements may be reported for such cells.

For the cells listed for the configured limit measurement, the UE may perform measurements in unrestricted subframes. In one embodiment, the network node may request the UE to separately perform measurements in unrestricted subframes, for example, an indicator may be included in the bounded measurement configuration. In reporting, the UE may determine which sub-frame the cell measurement was performed on, such as limited, unrestricted, or both, to the receiving node Can be displayed.

The UE may also determine that all reported cells are not measured in the restricted subframe or (B) at least N (N > = 1) reported cells are measured in the restricted subframe An aggregate indicator can be used.

The UE may also report information on signal quality levels in the unrestricted and restricted subframes. Examples of signal quality levels are SCH Es / lot (i.e., SCH SINR), RSRP, SCH reception level, and the like. The UE may report the signal level, especially when the same cell is individually measured in restricted or unrestricted subframes or in both restricted and unrestricted subframes. The reported information can also be expressed as the difference between the signal qualities of the dB scale in the two sets of subframes.

When a measurement can not be performed on at least some cells in the restricted subframe, the UE may report an error message or some indicator indicating that one or more cells in the cell list can not be measured. The UE may report an error either preemptively or when explicitly requested by the network node. The UE may also be requested by the network node for an error reason, e.g., the signal quality is below the threshold, the cell is not present (e.g., not identified) For example, the event trigger measurements and the number of reporting criteria, also known as parallel configuration measurements, may exceed a predetermined number that can be predefined by the standard or pre-configured by the implementation, for example).

The above-mentioned rules relating to the measurement report when the limit measurement pattern is constructed can also be applied to a specific condition, for example, a signal strength level. For example, if the signal strength level of a cell in an unrestricted subframe exceeds a threshold, the UE should be able to identify and report this cell. This embodiment may also be used to define a reporting criterion, for example, a minimum number of cells that can be measured simultaneously and a measurement that can be measured simultaneously.

A comparative measurement, which is one embodiment of the present invention, is one in which one measurement is superior to the other reference measurement Bad △ positive Measurement. The DELTA value may be an absolute or relative measurement.

The comparative measurement and the reference measurement may be associated with the same or different cells. When associated with the same cell, measurements may be performed under different conditions or for different time-frequency resources (e.g., in limited and unrestricted subframes).

Differences from conventional CSI reporting, where the UE can report measurements on restricted and unrestricted subframes, when reporting on the same cell, include, for example, the following.

An embodiment herein is applied to a cell other than a neighboring cell, i.e. PCell (using CA) or serving cell (using CA)

Embodiments herein include other measurements, and / or

The comparative measurement reported in accordance with at least some embodiments is one measurement, whereas for CSI both measurements are reported as absolute values.

Considering the signaling enhancements and the predefined rules for pattern construction and measurement reporting that include multiple carriers and start with a measurement pattern in the following series of embodiments, the explicit signaling of the multiple patterns implies signaling overhead, May be reduced using at least one of the predefined rules or indicators from a network node as described below.

In some embodiments, the UE is assumed to have the same or different pattern characteristics for different carrier frequencies (i.e., intra-frequency and inter-frequency carriers) based on predefined rules, or indicators of the serving network node to the UE. If the indicator is transmitted by the network to the UE, the simplest type of indicator can be represented by 1 bit information. These indicators may also include additional information such as the carriers on which the cells are to be measured, assuming that the pattern has the same characteristics. The pattern characteristics may be any one or more of a pattern sequence, a pattern blanking rate (e.g., one of ten subframes is displayed for measurement), a reference time at which the pattern begins (e.g., SFN = 0) .

In one embodiment, the same pattern characteristic can be assumed for all cells for all or at least a subset of the CCs configured in the CA. For example, PCC and SCC in the same band have the same pattern characteristic.

In some other embodiments, the UE assumes that the pattern is applied only to cells configured in the CA based on predefined rules or indicators of the serving network node to the UE, which indicates that the list is known to the configuration node and the UE It can be seen as providing a list of cells associated with the pattern without explicit signaling of the cell list.

In some embodiments, the UE may assume the same pattern characteristics as a predefined rule, or an indicator of the serving network node to the UE, for a particular measurement or for all measurements I have I suppose.

At least some of the pattern characteristics are the same for all cells for all or a subset of CCs in all carriers or CAs. For example, a blanking rate (e.g., 1/8 sub-frame) or pattern sequence may be used for all carriers or CC Although they are common, the reference time may be different.

In a possible implementation in the CA system, in the case of measurements on PCCs of cells other than PCell, the pattern characteristics may assume or represent the same or different from PCell. In the case of SCell's measurement for SCC, some embodiments assume that the pattern characteristic is equal to or different from PCell, or receives an indication that it is. In a CA, having the same measurement pattern for multiple cells can increase the buffer size, but on the other hand it allows more time for the " sleep &quot; mode.

In an embodiment applicable to the CA system, in the case of measurements for SCCs of cells other than SCell, the pattern characteristics may be assumed or represented as follows.

The same or different from the SCell for the same CC, or

The same or different from PCell for PCC,

· Same as or different from non-PCell for PCC.

The foregoing rules and associated signaling or indicators are applicable to patterns used in the downlink or uplink or in both directions. These rules or associated signaling are applicable independently or jointly to the uplink and downlink patterns. For example, pattern characteristics are common to all CCs in a DL but may differ for UL to CC in a CA system. As another example, it can be assumed that the pattern characteristics are the same in the DL CC as well as in the UL CC.

Now, considering the transmission pattern in this context, the same rule as described for the limiting measurement pattern can also be applied to the transmission pattern. Also, instead of signaling the transmission pattern for the cell, there may be an indicator that indicates whether the transmission pattern corresponds to a superset of the same or a less restrictive measurement pattern. Also, if multiple cells are included in a list associated with a bounded measurement pattern, there may be a set indicator that indicates, for example, that the transmitted pattern for the cells in the list corresponds to a superset of the bounded measurement pattern. As described above, the transmission pattern may be signaled to another network node (e.g., via X2 to the wireless node) or to UE [2] (e.g., via RRC).

Considering a constrained measurement configuration for the IDLE state, if the UE in the IDLE mode is configured with a constrained measurement pattern, then if a constrained measurement pattern is configured Lt; RTI ID = 0.0 &gt; UE &lt; Can be applied. In addition, the above-described reporting rules for the case in which the limiting measurement pattern is configured can also be applied in the IDLE state or as a logging rule of the UE in some other low activity state, e.g., dormant state. Logged measurements can be reported periodically or on a trigger or on request. This report can be made when the UE is in a connected state or when the UE proceeds to a state where the UE can report the measurement result to the network node. These rules may be particularly useful, for example, in MDT and SON. The UE may log these measurements for the purposes of MDT, SON, etc., and report it to an associated network node (e.g., serving node) as it proceeds to the connected state.

Ymin_IDLE < Ymin can be further defined. If broadcast, the cell list for the UE in the IDLE state is in the CONNECTED state May be longer than for the UE, since the cell list for the CONNECTED state is more accurate and can be signaled via dedicated signaling.

In the foregoing embodiments, the terms " measurement " and " measurement requirement " have been used. The following references describe the meaning of these terms in detail.

Measurement may typically be performed on a physical channel such as a specific channel or synchronization signal, a cell specific reference signal, a positioning reference signal, a dedicated reference signal, or the like.

Measurements may refer to mobility or any type of UE measurement used in a typical RRM; Examples include cell identification or PCI identification, cell global ID identification, cell global identification (CGI) or advanced CGI (ECGI) identification, RSRP, RSRQ, and the like. Another example is an example of radio link monitoring performed to monitor the quality of a serving cell. In the CA, the RLM is performed for at least PCell, but it can also be performed for one or more SCell.

Measurements may generally refer to timing measurements, for example, unidirectional propagation delay, RTT, timing advance, UE Rx-Tx, and the like.

The measurement may also include a position measurement related measurement or positioning timing measurement (e.g., RSTD, time of arrival, UE Rx-Tx time difference, timing advance, measurement), signal measurement (e.g., signal power or signal strength) , Cell identification reported for location purposes, and the like. In the case of UE-assisted or network-based location determination, the location measurement is typically requested by a location node (e.g., E-SMLC in LTE) and then performed by the UE or wireless node, such as LPP, LPPa, LPPe or similar Protocol to the location node. In the case of UE-based location, measurements may be performed by the UE and automatically configured by the UE or by another node (eNodeB, for example).

Measurement also refers to measurements performed for a particular purpose or SON, such as minimizing drive tests (e.g., coverage, paging channel quality or failure rate, broadcast channel quality or failure rate, etc.). See the discussion below for more details.

The above measurements may be performed in a frequency range between frequencies, between frequencies (in-band or inter-band) or between RATs (e.g., E-UTRA TDD or FDD) or (e.g., UTRA, GSM, CDMA2000 or HRPD UTRA cell between RATs measured in different RATs).

Further, the embodiments in this specification are not limited to the following, but can be applied to the following.

Single frequency / carrier or multiple frequency / carrier networks,

· Networks that use CA or do not use CA,

· CoMP,

For example, U.S. Provisional Patent Application No. 61 / 496,327, filed June 13, 2011, the disclosure of which is incorporated herein by reference, where DL and UL links may or may not be co-located A network over which measurements can be performed over various links as described,

Arrangements with distributed antenna systems (DAS) and RRUs.

A " neighbor cell " may be a cell for the same or another frequency or component carrier, and it may have the same or different DL and UL coverage and / or transmitter / receiver, which may be a DL only or UL dedicated cell.

Measurements may also refer to measurements performed over one or multiple wireless links (e.g., using CoMP, DAS, various links, etc.). (E.g., UL CoMP) in a DL, at least one link in a DL and at least one link in a UL (e.g., For example UE Rx-TX measurements, RTT, etc.). The multiple links may be for the same or different frequencies / carriers, and may be the same or different RATs.

Also, in the case of multiple links, one or more links may be activated and deactivated by a base station (eNode B in LTE, for example). Deactivation may be performed by the eNB, for example, using a short command such as ON / OFF (e.g., via PDCCH in LTE) (e.g., using 1 bit per link) Signaling. &Lt; / RTI &gt; The activate / deactivate command is transmitted to the UE via the primary link. Typically, deactivation is performed when there is no data to send over the secondary link (s), which is one problem for timing measurements that can not be based on data transmission. Activation / deactivation may be performed independently on uplink and downlink secondary links that cause two-dimensional timing measurements, for example, other problems for Rx-Tx measurements. Thus, the purpose of deactivation is to enable UE battery saving. A deactivated secondary link can also be activated by the same lower layer signaling.

Measurements may also refer to measurements performed by the UE to support functions such as scheduling, link adaptation, and the like. Examples of such measurements include channel state information (CSI) measurements or more specifically CQIs, class indicators, recommended layers for multi-antenna transmission, etc. Measurement.

Measurement may also refer to measurements performed by the UE for maintenance of serving cell quality or link performance. Examples of such measurements are out of sync detection, in-sync detection, radio link monitoring, channel estimation, and the like.

Measurement may also be performed by the UE or other node for various purposes such as uplink interference measurement, load estimation, propagation delay, mobility, location verification (e.g., BS RX-TX time difference measurement, signal arrival angle, timing advance, May refer to the measurements performed by the BS on the transmitted signal.

Measurements may also generally refer to measurements performed on UL and / or DL signals by a wireless node, including a wireless measurement unit (e.g., a physical node associated with an LMU or a logical LMU entity) and the like.

The above measurements may be performed by the UE or the wireless node and may be configured by a wireless node (e.g., a serving eNodeB) or other network node (a positioning node, an MDT node, an SON node, etc.). Measurements can also be received by and transparently to other nodes. For example, the location measurement reported to the location node is transmitted transparently through the serving eNodeB. As another example, one wireless node may forward information to another wireless node, for example, through X2 in a handover or via a repeater. As another example, an eNodeB can deliver radio measurements to an MDT or SON node. As another example, the UE may communicate measurements of other UEs or wireless nodes. Thus, the measurement rules described herein can be applied to any of the available measurement reporting methods, e.g., via a direct link, through a logical link, via delivery, etc. [

The Minimize Drive Test (MDT) feature was introduced in LTE and HSPA Rel-10. The MDT feature provides a means to reduce operator effort when gathering information for network planning and optimization purposes. The MDT feature requires the UE to log or acquire various types of measurement, event and curriculum related information. The logged or collected measurement or related information is then transmitted to the network. This is in contrast to the traditional approach in which operators have to collect similar information through so-called drive inspection and manual logging.

The UE may collect measurements in a low activity state, for example, in an idle state in UTRA / E-UTRA, a cell PCH state in UTRA, etc., as well as during a connection. Some examples of potential MDT UE measurements are:

· Coverage or mobility measurements, eg RSRP, RSRQ, etc.

· Random access failure

· Paging channel failure (PCCH decode error)

· Broadcast channel failure

· Radio link failure report

The E-UTRAN utilizes the concept of a self organizing network (SON). The purpose of the SON object is to allow the operator to automatically plan and coordinate network parameters and configure the network nodes.

Conventional methods are based on manual adjustments, which consume large amounts of time and resources and require considerable labor force improvement. Particularly, due to network complexity, a large number of system parameters, IRAT technology, etc., it is very attractive to have a reliable method and mechanism for automatically configuring the network whenever necessary. This can be realized by SON, which can be visualized as a series of algorithms and protocols that perform tasks such as automatic network coordination, planning, configuration, and parameter setting. To achieve this, SON nodes require measurement reports and results from other nodes, e.g., UE, base station, and the like.

Measurement requirements include, but are not limited to, measurement accuracy of the measurand (e.g., RSRP accuracy), measurement duration, cell identification time (e.g., PCI or CGI detection delay) Departure or normal synchronization detection delay, CSI quality or CSI reporting time, and the like.

Next, a network device (e. G., A serving eNodeB or location (e. G., A serving eNodeB or location) that configures transmission patterns at the wireless node, configures pattern characteristics at the UE, receives measurement results at the UE, (Other node, such as OK node, O & M, SON, MDT) I will discuss. The network node method, described below, But may be performed according to any of the other embodiments described.

8, a network device 145, for example, in communication with a wireless device, such as 130a, 130b in a heterogeneous network, includes a transceiver 142 and a processing unit 144, . The transceiver 142 is configured to enable communication with the wireless device . The network device 145 may also include a memory 146 configured to store executable code that causes the processing unit 144 and the transceiver 142 to operate as described below.

The processing unit 144 is configured to receive (via the transceiver 142) measurement results (from the wireless device, via the transceiver 142) that correspond to measurements of signals received by more than one cell by the wireless device. The processing unit 144 is further configured to interpret the measurement results in light of the fact that the wireless device performs measurements on signals received in more than one cell or signals transmitted to the cell in accordance with the first pattern and the second pattern. The first pattern is a sequence of a first type subframe and a second type subframe, wherein the first pattern is associated with the first cell and is provided to the wireless device. The second pattern is another sequence of the first type of subframe and the second type of subframe, the second pattern is associated with the second cell and is transmitted by the wireless device And is determined based on the first pattern and an index relating the first pattern and the second pattern. The processing unit 144 may also be configured to allow the wireless device to communicate with one or more And report the measurement results for the cell. In the following detailed description, for ease of explanation, reference will be made to a generic network node through the term network device as illustrated in FIG. 8 herein.

For example, the UE may perform one or more measurements according to the rules described above for the UE behavior when the limit measurement pattern is configured to send the measurement results to a serving network node, e. G., ENode B report.

The network node may likewise be configured to transmit a first pattern and / or an indicator associating the first pattern and the second pattern according to the embodiment described above. Alternatively, the network node may transmit the first pattern and the UE may determine the second pattern based on predetermined rules as described above.

The network node may receive the measurement results and process or interpret the results of the measurements performed according to the rules defined above. For example, the network node may estimate the difference between measurements performed by the UE over restricted and unrestricted resources (e.g., subframes) Be identifiable. This is done by comparing the following two cases: predefined requirements for limited and unmeasured measurements.

The network node must also be able to transmit indicators to the UE or to configure the UE with information regarding the pattern characteristics for the other carrier (in a single carrier or in a multi-carrier operation) as described above. The network node may also receive some information about the indicator or pattern characteristics for another carrier and / or transmit it to another network node. For example, eNode B (eNB-A) may indicate to neighboring eNode Bs that the pattern characteristics of performing measurements on all carriers or a subset of carriers used in eNB-A are the same or different. These indicators may be separate or common to DL carriers or UL carriers. Such indicators may also be specific to any type of carrier. Such an indicator may also be exchanged between network nodes in a transparent container, for example via X2. In this case, the receiving node (e. G., Serving eNB) may be able to perform a cell change during or before the cell change, such as PCell change, PCC change, handover RRC connection reset, And delivers an indicator about the target node (e.g., target eNode B) to the UE. This indicator is typically sent to the UE using the RRC in a cell change message, e.g., a handover command, RRC reconfiguration, and the like.

The network node may also send the information associated with the pattern to other nodes (e. G., Nodes, etc.) received from a measurement node (e. The measurement results may be communicated to a network node that performs tasks related to at least one of network management, network monitoring, network planning, network configuration, parameter setting, parameter adjustment, and the like. Examples of such nodes are O & M, OSS, SON, MDT, and the like. These nodes receive configuration information and / or results, interpret them for network planning and configuration, and use them. For example, these nodes may estimate and recommend an optimal number of certain base station types (e.g., pico BSs) within the network optimizing region or cell bandwidth, and so on.

Now, the above-described embodiment is referred to as a test case (And any wireless device, e.g., a mobile repeater, a wireless measurement unit, etc.), the method and rules described herein may be used to determine the measurement configuration method or other node (TE) node (also known as a system simulator (SS)), which may be communicated to the measurement node in the event that it is configured by a measurement node (e.g.

9, the TE node 150 includes a processing unit 154 and a transceiver 152. In addition, The processing unit 154 is configured to inspect at least one of the wireless device described above and the network device described above according to one embodiment. The transceiver 152 To enable wireless communication of the processing unit with the inspected wireless device or network device . TE node 150 may also include a memory (not shown) that stores executable code that causes processing unit 154 and transceiver 152 to operate as described below.

The TE node (or SS) is configured to identify one or more UE or network node requirements, procedures, signaling, protocols, and so on. The TE node implements the configuration method associated with the measurement pattern configuration that can configure the UE for inspection. The purpose of the inspection is to ensure that the UE is compatible with the predefined rules, protocols, signaling and requirements associated with the measurement patterns described in the above embodiments. These checks may be performed for frequency, frequency and RAT measurements under specified conditions of the rule. This inspection can also be performed for measurements on PCC and SCC in the CA. The checking may also be performed for UEs in an IDLE state or other low-activity mode. TE or SS in the inspection system will also be capable of at least one of the following:

·example In an embodiment of the invention Configuring the transmitting node with necessary transmission pattern information as described;

Constituting the UE to be inspected with necessary information related to the pattern characteristic described in the embodiment of the present invention;

Receiving UE measurement results associated with the bounded measurement pattern based on predefined rules or configurations performed by the TE or SS;

· Analyzing the received results, eg comparing with the reference results. The criteria may be based on predefined rules, requirements or UE behavior.

This inspection can also be performed in real networks, also known as field trials. In that case, the inspection procedure is implemented in a network node, e. G., ENode B, repeater, donor node, locating node, MDT node, SON node, In this case, the relevant network node (e. G., ENode B) needs to implement an inspection procedure to identify one or more characteristics of the constraint measurements performed by the UE. The network node may also be configured to identify one or more characteristics of the restriction measurements performed by the UE in a particular test mode. Thus, the network node needs to implement such a check mode and must be configurable either manually or by receiving a signal at another node (e.g., an operator controlled O & M node).

A flowchart of a method according to an embodiment performed in a wireless device of a wireless communication system is illustrated in FIG. In the figure, at step 1100, the UE receives a radio signal on at least a first carrier frequency. The radio signal includes information about a first pattern associated with a first carrier frequency. The first pattern is a sequence of a first type sub-frame and a second type sub-frame. In step 1102, the UE determines a second pattern, and the determination is based on at least one of a first pattern and an indicator and a predetermined rule, the indicator or preset rule being associated with a first pattern . As shown in step 1104, the first pattern and the second pattern are at least one of a measurement pattern and a transmission pattern. In this context, the transmission pattern may be referred to as a signal transmission pattern or a signal transmission pattern interchangeably. The signal may be a physical signal or a physical channel or a combination thereof and may be transmitted over one or more time-frequency resources. And may be applied to one or more signals.

The foregoing embodiments may provide one or more of the benefits or advantages, including, but not limited to,

A method of configuring a UE at a network node into a measurement according to the described rules;

Clear UE measurement and reporting when the measurement pattern is used;

· Reduction of signaling overhead when constructing multiple patterns;

· CA And signaling reduction for limiting measurements performed on multiple carriers (e.g., between frequencies);

The UE behavior is defined to enable interpretation of the results; And / or

The method of confirming the limit measurement using the inspection system or in the field.

The above-described exemplary embodiments are intended to be illustrative in all aspects of the invention rather than limiting. All such modifications and variations are considered to fall within the scope and spirit of the invention as defined by the following claims. Elements, acts, or orders used in the description of the present application should not be construed as critical or essential to the invention unless explicitly so stated. Also, the term " a " as used herein is intended to include one or more items.

Claims (23)

  1. A wireless device comprising:
    A transceiver configured to receive at least wireless signals on at least a first carrier frequency, the transceiver being further configured to receive information on a list of neighbor cells and a measurement pattern associated with the first carrier frequency, Is a sequence of a first type of subframes and a second type of subframes, wherein the first type subframes are restricted subframes and the second type subframes are unrestricted (unrestricted) subframes; And
    A processor configured to perform measurements on a plurality of cells for a predetermined period of time, the plurality of cells comprising: at least one cell identified by a list of neighboring cells and measured according to the measurement pattern; Wherein the at least one cell is not included in the list of neighboring cells and is measured without applying the measurement pattern, the at least one cell being identified by the wireless device and not being included in the list of neighboring cells, Wherein the number of at least one cell is determined based on the number of at least one cell identified by the list of neighboring cells and measured according to the measurement pattern,
    Lt; / RTI &gt;
    Wherein the processor is further configured to report results of the measurements on the plurality of cells being performed for the predetermined period of time,
    The transceiver further includes:
    (A) determining that the measurements are performed in the first type of subframes according to the measurement pattern,
    (B) that the measurements are performed in the second type of subframes according to the measurement pattern,
    (C) calculating, in accordance with the measurement pattern, And that the measurements have been performed in the second type of subframes,
    (D) that none of the measurements have been performed in the first type of subframes, or
    (E) that a minimum number of measurements have been performed in the first type of subframes
    The measurement report comprising information representative of at least one of the plurality of measurement reports.
  2. The method according to claim 1,
    Wherein the plurality of cells in which measurements are performed during the predetermined period comprises at least one of a number of cells equal to or greater than a minimum number of cells and a number of cells equal to or less than a maximum number of cells.
  3. The method according to claim 1,
    Wherein at least one cell among the plurality of cells in which measurements are performed for the predetermined period of time identified by the wireless device and not included in the list of neighboring cells comprises: The wireless device comprising:
  4. 3. The method of claim 2,
    Wherein at least one cell among the plurality of cells in which measurements are performed during the predetermined period of time identified by the wireless device and not included in the list of neighboring cells comprises determining whether the cells identified by the list of neighboring cells are all The wireless device is measured after being measured.
  5. The method according to claim 1,
    Wherein the first carrier frequency is a serving carrier frequency and further comprises a second carrier frequency that is an inter-frequency carrier frequency.
  6. The method according to claim 1,
    Wherein the first carrier frequency is a primary component carrier and further comprises a second carrier frequency that is a secondary component carrier in a multi-carrier system, a coordinated multipoint system, or in a distributed antenna system.
  7. The method according to claim 1,
    The processor may further comprise:
    Determine the number of one or more cells in which the measurements are to be performed in the second type of subframes,
    To report measurement results for the determined one or more cells
    The wireless device.
  8. delete
  9. delete
  10. delete
  11. The method according to claim 1,
    The processor comprising:
    A rule that a minimum number of cells are measured in each subframe; And
    A rule that a predetermined number of cells are measured in each sub-frame of the second type
    And to perform measurements in accordance with at least one of the following:
  12. delete
  13. The method according to claim 1,
    Wherein the transceiver is further configured to transmit a measurement report comprising information on signal quality in the first type of subframes and in the second type of subframes according to the measurement pattern.
  14. The method according to claim 1,
    The measurements may include measurements for mobility measurements, measurements for radio resource management, measurements for radio link monitoring, or measurements for channel state information, timing measurements, positioning measurements, a measurement for minimization of drive tests, a measurement for self organizing networks, or a measurement performed in a CONNECTED state.
  15. The method according to claim 1,
    Wherein the wireless device is a user equipment, a relay, a repeater, or a measurement node.
  16. CLAIMS What is claimed is: 1. A method for processing wireless signals performed by a wireless device and associated with wireless communications,
    Receiving radio signals over at least a first carrier frequency, the radio signals including information on a list of neighboring cells and a measurement pattern associated with the first carrier frequency, the measurement pattern comprising a first type of sub- And a sequence of a second type of subframes, wherein the first type of subframes are restricted subframes and the second type of subframes are unrestricted subframes;
    The method comprising: performing measurements on a plurality of cells for a predetermined period of time, the plurality of cells comprising at least one cell identified by a list of neighboring cells and measured according to the measurement pattern, At least one cell that is not included in the list of cells and is measured without applying the measurement pattern, wherein at least one cell identified by the wireless device and not included in the list of neighboring cells and measured without applying the measurement pattern Wherein the number of one cell is determined based on the number of at least one cell identified by the list of neighboring cells and measured according to the measurement pattern; And
    Reporting the results of the measurements on the plurality of cells performed during the predetermined period of time
    Lt; / RTI &gt;
    In the measurement report,
    (A) determining that the measurements are performed in the first type of subframes according to the measurement pattern,
    (B) that the measurements are performed in the second type of subframes according to the measurement pattern,
    (C) calculating, in accordance with the measurement pattern, And that the measurements have been performed in the second type of subframes,
    (D) that none of the measurements have been performed in the first type of subframes, or
    (E) that a minimum number of measurements have been performed in the first type of subframes
    &Lt; / RTI &gt;
  17. 17. The method of claim 16,
    Wherein performing the measurements comprises performing measurements on at least one of a number of cells equal to or greater than a minimum number of cells and a number of cells equal to or less than a maximum number of cells.
  18. 17. The method of claim 16,
    Wherein the at least one measured cell identified by the wireless device is measured after all of the cells identified by the list of neighboring cells have been measured.
  19. 18. The method of claim 17,
    Wherein the at least one measured cell identified by the wireless device is measured after all of the cells identified by the list of neighboring cells have been measured.
  20. As a network node,
    A processor configured to receive measurement reports for a plurality of cells measured for a predetermined period of time from at least one wireless device and to interpret the measurement reports using knowledge of a list of neighboring cells and a measurement pattern,
    Wherein the measurement pattern is associated with a first carrier frequency and the measurement pattern is a sequence of sub-frames of a first type and a second type of sub-frames, the first type of sub-frames being restricted sub- Gt; subframes &lt; / RTI &gt; are unrestricted subframes,
    Wherein the plurality of cells measured during the predetermined period comprises at least one cell identified by the list of neighboring cells and measured in accordance with the measurement pattern and at least one cell identified by the at least one wireless device, And at least one cell that is not included and is measured without applying the measurement pattern,
    Wherein the number of at least one cell identified by the at least one wireless device and not included in the list of neighboring cells and measured without applying the measurement pattern is identified by a list of neighboring cells, Is determined based on the number of at least one cell measured,
    In the measurement report,
    (A) determining that the measurements are performed in the first type of subframes according to the measurement pattern,
    (B) that the measurements are performed in the second type of subframes according to the measurement pattern,
    (C) calculating, in accordance with the measurement pattern, And that the measurements have been performed in the second type of subframes,
    (D) that none of the measurements have been performed in the first type of subframes, or
    (E) that a minimum number of measurements have been performed in the first type of subframes
    And information indicating at least one of the network node and the network node.
  21. 21. The method of claim 20,
    Wherein the plurality of cells for which measurements are performed for the predetermined period comprises at least one of a number of cells equal to or greater than a minimum number of cells and a number of cells equal to or less than a maximum number of cells.
  22. 21. The method of claim 20,
    Wherein the at least one measured cell identified by the at least one wireless device is measured after all of the cells identified by the list of neighboring cells have been measured.
  23. 22. The method of claim 21,
    Wherein the at least one measured cell identified by the at least one wireless device is measured after all of the cells identified by the list of neighboring cells have been measured.
KR1020167006782A 2011-08-22 2012-07-06 Measurement and reporting configuration in radio communication networks KR101889626B1 (en)

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